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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc0666df9ccd8890454d422fe18bd4d4588a4762f72137c46c20a8aaef5624fb' 
  AND token = '9dDKlOzD+fq3PZrlILvjrV8fy4bVseYbPgV4JCKRD9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}